Re: Timing Pulleys - Chain & sprockets?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
wrote:

> Hello again,
>
> Use an old bicycle commuter trick for the chain lubrication...

(With

> thanks to George Sheehan, of Bicycling magazine.)
>
> Drop it in a pail of melted paraffin WAX (NOT kerosene for those of
> you across the pond!<G>). Let it "cook" awhile-45 minutes or so.

Then

> remove and let it "drip" dry/cool. At first it will be quite

stiff,

> but then will retain its lubricity for a long time, without drawing
> dist/dirt/swarf to itself...
>
> #25 chain is good for about 480 lbs, so use a pre stretch to get

rid

> of the initial looseness, then run it tensioned at a value which
> makes sense in light of the above, and your gantry/axis weight.
>
> Hope this helps,
>
> Ballendo

I see this as on topic as it goes to building the machines.

About pre-stretch, Chain should have manufactures specs for break in
and adjustment, and a home shop would probably have a tentioner.

Would you think that putting the chain and sprockets together and
then run them for the initial breaking period before the wax dip ?

I have 8 L gears for a series of belts to be driven from a central
motor and to power a pair of gears. the 60 inches from side to side
was too far for a single belt so I am getting the parts together for
a middle span jackshaft or each side. that would be a minimum of 4
belts, possibly 6. yeah, adjustments will be a horrible task.

a chain would be MUCH easier.

I'm working on a plasma/router table to do aluminium sheet metal
parts. 4 ft x 8 ft work envelope.

Dave